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http://dx.doi.org/10.14190/JRCR.2019.7.2.166

Fundamental Research on Reactivity of Silica Source in the Rapidly Cured Inorganic Micro-Defect-Free(MiDF) Concrete  

Choi, Hong-Beom (Department of Architectural Engineering, Kongju National University)
Kim, Jin-Man (Department of Architectural Engineering, Kongju National University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.7, no.2, 2019 , pp. 166-173 More about this Journal
Abstract
In this paper, the reaction properties of silica source in the accelerated curing conditions using autoclave and the fundamental properties of inorganic Micro Defect Free(MiDF) concrete using silica source are studied. Studies show that Si ions elution rate from silica source in autoclave curing is higher in amorphous source. In tap water conditions, solids which is source after autoclaved curing show a higher mass reduction in amorphous materials, which is attributed to the higher elution rate of ion. In $Ca(OH)_2$ solution conditions, amorphous materials show higher mass increase, due to increase in C-S-H minerals. From experiment for influence on the properties of MiDF concrete by using nano silica materials, the specimen with silica fume shows an increase in compressive strength and a decrease in absorption depending on replacement rate up to 5.5%, while nano silica with amorphous phase and high-fineness shows a decrease in compressive strength and decrease in the water absorption. The specimen with nano silica increases the pore below 10,000nm, but reduces pore between 10,000 and 100,000nm. The above results show that the porosity and absorption rate of MiDF concrete can be reduced by using amorphous nano-size silica. However, to reduce the pore of 50 to 10,000nm, better dispersion of nano material in the cement matrix will be necessary. We will focus on the this item in the next research.
Keywords
Micro defect free concrete; Nano silica; Silica fume; Pore;
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1 Binici, H., Aksogan, O., Shah, T. (2005). Investigation of fibre reinforced mud brick as a building material, Construction and Building Materials, 19(4), 313-318.   DOI
2 Rodrigues, R., De Brito, J., Sardinha, M. (2015). Mechanical properties of structural concrete containing very fine aggregates from marble cutting sludge, Construction and Building Materials, 77, 349-356.   DOI
3 Chang, Y.H., Huang, P.H., Wu, B.Y., Chang, S.W. (2015). A study on the color change benefits of sustainable green building materials, Construction and Building Materials, 83, 1-6.   DOI
4 Ribeiro, C.E.G., Rodriguez, R.J.S., de Carvalho, E.A. (2017). Microstructure and mechanical properties of artificial marble, Construction and Building Materials, 149, 149-155.   DOI
5 Kim, M.H. (2017). Preparation and Characterization of Chopped Carbon Fivers Reinforced Artificial Marble Composites for Heating Panel, Master's Thesis, Jeonju University, Korea.
6 Birchall, J.D., Howard, A.J., Kendall, K. (1981). Flexural strength and porosity of cements, Nature, 289(5796), 388.   DOI
7 Donatello, S., Tyrer, M., Cheeseman, C.R. (2009). Recent developments in macro-defect-free (MDF) cements, Construction and Building Materials, 23(5), 1761-1767.   DOI
8 Drabik, M., Mojumdar, S.C., Slade, R. (2002). Prospects of novel macro-defect-free cements for the new millennium, Ceramics-Silikaty, 46(2), 68-73.
9 Rodrigues, F.A., Joekes, I. (1998). Macro-defect free cements: a new approach, Cement and concrete research, 28(6), 877-885.   DOI
10 Lothenbach, B., Nonat, A. (2015). Calcium silicate hydrates: solid and liquid phase composition, Cement and Concrete Research, 78, 57-70.   DOI